I have an African Grey parrot she's about 26 years old. She was wild caught and also had been severely abused when we got her about 9 years ago. She is semi tame, will get on my finger only if she flies or falls off her playstand, she's out of her cage all day only usually goes into her cage at night. After I wheel her into the room where she sleeps she gets all mushy and lets me scratch her head and plays with my finger with her tongue, we've had this routine for several years but this is the only time I can touch her. For the past four days she's let me stroke her head for about a minute then she suddenly attacks and bites. I don't believe it's hormonal because we've been through that, she's even laid eggs and at those times she's very affectionate even allowing me to pet her while she was sitting on her eggs. Nothing has changed so I don't understand why this sudden aggression, she even has a little squeak she makes if she thinks I haven't petted her long enough, she's doing that now but when I go in there she's ready to attack doing a little war dance. Does anyone have any ideas what brought this on and how I can correct it.